The rapid growth of KDP crystals was demonstrated at growth rates of u
p to 54 mm/day. Thermal and acoustic energy were used in the saturated
solution to delete clusters of molecules. High supersaturations large
r than 120% were achieved by overheating of the mother solution by 25
K. The application of acoustic energy to the solution was also used to
achieve high supersaturation. The dissolution of the clusters in the
solvent was discussed, explaining the rapid growth rates.